Minor typo in quickstart.ipynb

[emptymalei]

In the first example, t_span in the lightning module should be self.t_span

t_span -> self.t_span

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1e8979a) 66.15% compared to head (07ca60e) 65.30%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #207      +/-   ##
==========================================
- Coverage   66.15%   65.30%   -0.86%     
==========================================
  Files          29       29              
  Lines        2074     2101      +27     
==========================================
  Hits         1372     1372              
- Misses        702      729      +27     

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[Zymrael]

Thanks!